Not a vegan, but the idea is ethical interactions with other animals. Since cows can’t consent to be food, we can’t eat them, likewise, their leather or milk. Bees can’t be required to use hives or be moved around for agricultural purposes. Interestingly, it can be argued that eating roadkill is ethical veganism - the animal is already dead, and not directly or indirectly for your benefit. Your eating it is incidental to its death. Cannibalism could be argued, as well, because the person could give you permission to eat them after they die and if you don’t take a hand in their killing the ethical consumption issues have been considered. Moral and health issues may be relevant for both roadkill and cannibalism.
Not a vegan, but the idea is ethical interactions with other animals. Since cows can’t consent to be food, we can’t eat them, likewise, their leather or milk. Bees can’t be required to use hives or be moved around for agricultural purposes. Interestingly, it can be argued that eating roadkill is ethical veganism - the animal is already dead, and not directly or indirectly for your benefit. Your eating it is incidental to its death. Cannibalism could be argued, as well, because the person could give you permission to eat them after they die and if you don’t take a hand in their killing the ethical consumption issues have been considered. Moral and health issues may be relevant for both roadkill and cannibalism.